Its either called a venscule or a vinculum.
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It is the solidus line or bar that separates the numerator from the denominator in a fraction.
It is the solidus line that separates the numerator from the denominator in a fraction.
The line separates the numerator and the denominator.
The line that separates the top number (numerator) from the bottom number (denominator) of a fraction can be called a dividing line - since this is what is happening in the sum itself to calculate the fraction.
whats the the line between fractions